Reciprocating hammer mechanism



March 3, 1959 M. F. DUFT RECIPROCATING HAMMER MECHANISM INVENTOR.

2 Sheets-Sheet 1 Marion F. Duff ww'rzem Filed Sept. 7, 1956 M. F. DUFT RECIFROCATING HAMMER MECHANISM March 3, 1959 2 Sheets-Sheet 2 Filfed Sept. 7, 1956 Marian F. Duff INVENTOR.

BY w f zzq 2,8 ,5 7 RECIPRO'CATING HAMMER- ec an sm Marion F. Duft, Roosevelt, Wash. Application September 7, 1956, Serial o. 03, 20 8 Claims. or. arms This invention comprises a novel and useful improvement in a reciprocating hammer mechanism and more particularly relates to a power operated mechanism for dress n dri s- The principal purpose of this invention is to provide a mobile apparatus specifically adapted for effectively dressing or sharpening and facing drill bits.

A further object of the invention is to provide an apparatus in accordance with the preceding object wherein a power operated reciprocating hammer may be readily ar d effectively applied to a drill bit at selected angles with respect to the face of the same for'shaping and dressing the drill bit.

A further object of the invention is to provide an a para in n mi ith he precedi Qbieq Wherein' means are provided for accommodating different lengths of bits, and for positioning the hits at different l t d angles i h e t to the r c proc in h mmer for accurately dressing the bit,

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numeralsrefer to like parts throughout, and in which:

Figure 1 is. a side elevational view, eertain concealed parts being shown in dotted lines therein, and illustrating the manner in which the mobile apparatus in accordance d with this invention is utilized for dress ng and shaping a drill bit for restoring the worn cutting edge to the same;

Figure 2 is a top plan view ofthe apparatus of Figure 1;

Figure 3 is a detail view showing in transverse elevation a portion of the adjustable cradle for positioning the face of a drill bit at an appropriate angle for dressing and shaping the same;

Figure 4 is a detail view taken partly in central longitudinal section through a portion of the apparatus and showing in particular the reciprocating hammer, the manner in which the same is slidably and guidably mounted together with the means connecting the hammer tothe source of power for the same;

Figure 5 is a vertical transverse sectional detail view taken substantially upon the plane indicated by the section line 5-5 of Figure 4;

Figure 6 is a horizontal sectional detail view taken substantially upon the plane indicated by the section line 6-6 of Figure 3; and

Figure 7 is a perspective view of a portion of the mechanism for adjusting the drill bit supporting means.

Drill bits and espeeially those ofthe wire line type in the course of their use become dull, necessitating dressing of the bit and restoring the cutting edge of the. same. This involves usually a time consuming and laborious operation if the bit is to be dressedv manually, and frequently requires a considerable delay if the bit is to be sent to a shop having the proper facilities fordressing the United States Paten 2,875,647. Patented Mar. 3, 1959 such bits become shorter in length thereby posing a problem for their further sharpening and dressing by the use of automatic machinery.

The present invention provides an apparatus which although having other uses, is especially adapted for the dressing and sharpening of drill bits.

In carrying out the purpose of this invention there is provided an apparatus of a mobile or portable nature which employs a relatively heavy, appropriately shaped power operated reciprocating hammer together with means for adjustably positioning a drill bit with respect thereto whereby the face of the drill bit may be ham mered into the proper shape to thereby dress and sharpen the bit.

In the accompanying drawings illustrating one satisfactory embodiment of the apparatus in accordance with the principles of this invention there is provided a suitable wheeled mobile apparatus having a frame designated generally by the numeral 10, which is provided with a connection 12 whereby the apparatus may be secured to a vehicle for towing by the same. Mounted upon the rear portion of the frame of the apparatus, is a suitable power plant which may comprise an internal combustion engine or the like, and which is designated generally by the numeral 14. This engine through a suitable driving belt 16 operates a pulley 18 carried by the end of the crank shaft 20 which is suitably journaled and mounted upon the frame of the apparatus. Also mounted upon the framework 10 is a pair of parallel longitudinally extending rails 22 and 24 upon which is slidably received a platform or carriage 26 having an elongated member 28 pivotally secured thereto and extending medially of the rails 22 and 24 towards the power plant. A series of longitudinally spaced apertures 30.are provided in the member 28 for a purpose to be subsequently set forth.

Secured upon the plate 26 is an upstanding end plate 32 together with a pair of angularly disposed upstanding walls 34 and 36. The plate 26 together with the walls 32 and 34 and 36 comprises a relatively stationary support or foot rest for a drill bit 40 which is to be dressed and sharpened by the apparatus.

In addition to the adjustable foot support member 26 there is provided an adjustable head support for the drill bit 40 to position the same for dressing by the apparatus. This head support, as will be best apparent from Figures 1, 2 and 3 comprises a transversely disposed channel member 42 slidably carried upon a transverse bar 44 constituting a part of the mobile frame 10 of the apparatus.

A pair of support brackets 46. and 48 are laterally adjustably mounted upon the top of the channel member 42 as by fastening bolts 50 which are adapted to be secured in transversely spaced apertures 52 in the slidable channel member 42. Thus the brackets or standards 46 and 48 may be adjusted relative to each other for thereby supporting different sizes of drill bits 40.

Means are provided for shifting the channel 42 constituting the base member of the head support of the drill bit, transversely of the frame member 44. For this purpose a connecting rod 54 is pivoted to a side of the channel member 42 as by a pivot member 56, and in turn is pivotally connected as at 58 to a crank arm 60. The crank arm 60 extends radially from one end of a shaft 62 which is journaled in suitable brackets 64 upon the side of the frame 10. The other end of the shaft 62 has a. hand lever 66 whereby a rocking motion may be imparted to the shaft 62 and thus cause a relative sliding movement of the base channel member 42 upon the frame 44. By this means, the head portion of a drill bit to be dressed may be shifted laterally of the supporting frame while thev foot portion of the drill bit is held in the foot support 26.

in the apertures 76 a bar 78 shown in dotted lines in Figure 7 and constituting a handle by which rotation may be imparted to the shaft 70.

Intermediate the ends of the shaft there is fixedly secured a gear 80 which is positioned to cooperate with the above mentioned series of apertures or recesses 30 on the member 28. By rotation of the shaft 70, and

engagement of-the gear 80 with the apertures 30, the

member 28 may be moved in either direction to thereby position the foot member 26 at a selected and adjustable distance from the head support member. Thus the device may be adapted to accommodate different lengths of drill bits and to compensate for the reduction in length of a drill bit by virtue of wear.

There is also provided a means for retaining a drill bit in position with its head portion secured in the head support of the apparatus. This structure, as shown in Figures 3 and 6 comprises a channel member 84 having its open side facing towards the support standards 46 and 48, and secured at its lower end to the side of the slidable channel base member 42. The opposite side walls of the channel 84 are provided with vertically elongated slots 86 and by means of a fastening nut and bolt 88 slidably received in' the slots, a lever 90 is pivotally secured to the vertical channel member in vertically adjusted position thereon. The lever 90 is adapted to be moved from the vertical position shown in full lines in Figure 3 to a horizontal position to lie across a drill bit when the head of the latter is placed in the head support brackets 46 and 48, and the lever may be secured and retained inits closed position upon the head supports as by means of a chain 92 engaging a hook 94 on the lever. Thus, the head portion of a drill bit may be releasably secured in the head supports during treatment of the same by the reciprocating hammer means to be now described.

Referring now specifically to Figures 1 and 2 it will be seen that a pair of fixed standards or support members 96 and 98 are secured at their lower ends to the rails 22 and 24, and are provided with vertically spaced aper tures 100 thereon. Secured between the standards 96 and 98in vertically adjusted position therebetween by means of fastening bolts 102is a sleeve 104. Secured in this sleeve as by a locking bolt 106 is a cylindrical guide sleeve 108 which is open at both of its ends and which at its rear end has welded thereto a pair of supporting arms or plates 110, the latter being pivotally secured as at 112 to the frame 10. By means of these supporting arms 110, the guide sleeve 108 and the sleeve 104 in which the guide sleeve is supported may be vertically adjusted.

Reciprocable within the guide sleeve 108 is asolid generally cylindrical member 114 comprising a hammer. As will be best apparent from Figures 4 and this hammer is providedwith longitudinally extending guideways 116 upon opposite sides of the same and complementary guide ribs 118 extending longitudinally of the sleeve 108 are received in these guideways for imparting guided reciprocation to the hammer.

The crank shaft 20 previously mentioned is provided with a crank throw 120 to which is secured a connecting rod 122. At its forward end the connecting rod has a wrist pin 124 by means of which the same is secured pivotally toa coupling member 126. The latter is pro vided with a flat plate like portion 128 through which extend fastening bolts 130 which in turn are secured to the hammer 114. Compression springs 132'and 134 are disposed on opposite sides of the plate 128 about'the bolts to thereby resiliently couple the hammer to the 4 connecting rod, it being understood that the bolts are slidable through the plate like member 128. Accord ingly, as the crank shaft 20lis rotated by the power plant, a reciprocation motion is carried to the hammer member 114, the latter being cushioned at each end of its stroke by the resilient means 132 and 134.

As will be best apparent from a consideration of Figure 4, the hammer 114 is provided with inclined faces 140 upon diametrically opposite portions of the same. By adjusting the relative height of the guide sleeve of the hammer, and by laterally adjusting the head support, the drill bit may be so positioned as to place the face of the same 'at the desired angle with respect to the impact surface of the hammer, whereby the reciprocating hammer will shape and dress the face of the drill bit to the desired contour, to thereby restore the bit to its operative condition.

In some-instances, in order to provide'a simpler and more economical construction, the longitudinal, internal ribs 118 may be replaced with a pair of inwardly projecting bolts, threaded through bores in the wall of the member 108 and slidably engaged in the guiding keyways 116.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A device for dressing drill bits comprising a support frame, foot and head supports on said support frame for holding adrill bit to be dressed, means for clamping a drill bit in said supports, a reciprocable hammer for dressing a drill bit, means including a crankshaft and connecting rod for positively reciprocating said hammer, means including a guide sleeve receiving and guidingly supporting said hammer during its reciprocation, means for adjusting the height of said guide sleeve and thereby the vertical inclination of the line of reciprocation of said hammer, means for laterally adjusting the head support relative to said hammer.

2. A device for dressing drill bits comprising a support frame, foot and head supports on said support frame for holding a drill bit to be dressed, means for clamping a drill bit in said supports, a reciprocable hammer for dress.- ing a drill bit, means including a crankshaft and connect ing rod positively reciprocating said hammer, means including a guide sleeve receiving and guidingly supporting said hammer during its reciprocation, means for adjusting the height of said guide sleeve and thereby the vertical inclination of the line of reciprocation of said hammer, means for laterally adjusting the head support relative to said hammer, a pair of tracks on said support frame, said head support being stationarily mounted, said foot support beingmounted for sliding movement on said track towards and from said head support, means for moving said foot support along said tracks, said last means including a member secured to said foot support and projecting therefrom and'having apertures spaced longitudinally thereof, a shaft journaled on said frame and having a gear fixed thereto-and engaging said apertures.

3. A device for dressing drill bits comprising a support frame, foot and head supports on said support frame for holding a drill bit to be dressed, means for clamping a drill bit in said supports, a reciprocable hammer for dressing a drill bit, means including a crankshaft and connecting rod positively reciprocating said hammer, means including a guide sleeve receiving and guidingly supporting said hammer during its reciprocation, means for adjusting the height 'of said guide sleeve and thereby the vertical inclination'of the line 'of reciprocation of said hammer, means for laterallyv adjusting the head support relative to said hammer, said lateral adjusting means including a slide mounted on said frame for sliding movement transversely thereof, support brackets on said slide for sup porting therebetween the head of a drill bit, actuating means for effecting lateral movement of said slide.

4. The combination of claim 3 including means for securing said support brackets upon said slide in laterally adjusted positions thereon.

5. A device for dressing drill bits comprising a support frame, foot and head supports on said support frame for holding a drill bit to be dressed, means for clamping a drill bit in said supports, a reciprocable hammer for dressing a drill bit, means including a crankshaft and connecting rod positively reciprocating said hammer, means including a guide sleeve receiving and guidingly supporting said hammer during its reciprocation, means for adjusting the height of said guide sleeve and thereby the vertical inclination of the line of reciprocation of said hammer, means for laterally adjusting the head support relative to said hammer, means securing the guide sleeve to the support frame for vertical pivoting movement, brackets pivoted to said guide sleeve and vertically adjustable relative thereto.

6. The combination of claim 1 wherein said hammer reciprocating means includes a connection resiliently secured to the connecting rod and to said hammer.

7. The combination of claim 6 wherein said connectionincludes a plate pivoted to the connecting rods, fastening rods rigidly secured to the hammer and slidably secured to the plate and operatively connected to said fastening rods for yieldingly opposing sliding movement of the hammer relative to said plate.

8. A device for dressing drill bits comprising a support frame, foot and head supports on said support frame for holding a drill bit to be dressed, means for clamping a drill bit in said supports, a reciprocable hammer for dressing a drill bit, means including a crankshaft and connect ing rod positively reciprocating said hammer, means including a guide sleeve receiving and guidingly supporting said hammer during its reciprocation, means for adjusting the height of said guide sleeve and thereby the vertical inclination of the line of reciprocation of said hammer, means for laterally adjusting the head support relative to said hammer, means securing the guide sleeve to the support frame for vertical pivoting movement, brackets pivoted to said guide sleeve and vertically adjustable relative thereto, said hammer and guide sleeve having cooperating guide channels and guide ribs.

References Cited in the file of this patent UNITED STATES PATENTS 971,208 Mills Sept. 27, 1910 1,026,002 Shearer May 14, 1912 1,407,286 Lee Feb. 21, 1922 1,667,236 Bergquist Apr. 24, 1928 1,745,143 Bergquist Jan. 28, 1930 2,631,479 Shilson Mar. 17, 1953 

